L6725TR STMicroelectronics, L6725TR Datasheet - Page 18

IC CTRLR PWM ADJ STP DWN 16SOICN

L6725TR

Manufacturer Part Number
L6725TR
Description
IC CTRLR PWM ADJ STP DWN 16SOICN
Manufacturer
STMicroelectronics
Datasheet

Specifications of L6725TR

Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
550kHz
Duty Cycle
100%
Voltage - Supply
4.5 V ~ 18 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 85°C
Package / Case
16-SOIC (3.9mm Width)
Frequency-max
550kHz
Output Voltage
0.6 V to 18 V
Output Current
30 A
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
For Use With
497-5867 - EVAL BOARD 20A 250KHZ L6725497-5500 - EVAL BOARD FOR L6725
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-5096-2

Available stocks

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Manufacturer
Quantity
Price
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Application details
6
6.1
Figure 13. Inductor current ripple.
18/32
Application details
Inductor design
The inductance value is defined by a compromise between the transient response time, the
efficiency, the cost and the size. The inductor has to be calculated to sustain the output and the
input voltage variation to maintain the ripple current (ÄI
maximum output current. The inductance value can be calculated with the following
relationship:
Where F
Figure 13
V
Increasing the value of the inductance reduces the ripple current but, at the same time,
increases the converter response time to a load transient. If the compensation network is well
designed, during a load transient the device is able to set the duty cycle to 100% or to 0%.
When one of these conditions is reached, the response time is limited by the time required to
change the inductor current. During this time the output current is supplied by the output
capacitors. Minimizing the response time can minimize the output capacitor size.
IN
= 5V and V
8
7
6
5
4
3
2
1
0
SW
0
shows the ripple current vs. the output voltage for different values of the inductor, with
is the switching frequency, V
IN
= 12V at a switching frequency of 500KHz.
1
O UT P UT V O L T AG E (V )
L
2
Vin
Fsw
∆ ⋅
Vout
IN
I
L
is the input voltage and V
3
Vout
Vin
(2)
L
) between 20% and 30% of the
4
Vin=5V, L=500nH
Vin=12V, L=1uH
Vin=5V, L=1.5uH
Vin=12V, L=2uH
OUT
is the output voltage.
L6725 - L6725A

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